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DMS-40PC Series
4? Digit, LED Display Digital Panel Voltmeters
APPLICATIONS
2. Differential Input Con?gurations : Differential inputs can also be
measured with DMS-40PC meters as shown in the circuit of Figure
3. Differential inputs must also originate from power supplies that
have a common ground with the meter’s 5V RETURN (pin 3). However,
differential inputs usually have both terminals above and/or below
5V RETURN. Figure 3, though not necessarily a typical real-world
When using other, higher-power, DMS-40PC models in combina-
tion with three-terminal regulators, be sure to consult the regulator
manufacturer’s data sheet to ensure the device is being utilized safely
and correctly.
application, does serve the purpose of illustrating the concept of a
differential signal.
LM2931T-5
1
+5V SUP
(+) IN HI
11
DMS-40PC-2-RL
The voltages developed across R1, R2 and R3 are equal to each other
and measure approximately +1.6666Vdc or 1/3 of the +5V power
source. More importantly, while the signal across R3 is single-ended,
+
–
4.5 - 18Vdc
IN
OUT
GND
22μF
10V
+
3
5V RET
5
DP2
both ends of R1 and R2 are well above ground and are described
here as being differential. Please note that while the DMS-40PC can
measure the voltages across either R2 or R3, it cannot measure
the +1.6666 volts across R1! The voltage at the lower end of R1 is
12
(–) IN LO
Figure 4. 4.5-18V Power Supply Monitor
approximately 3.333V and this exceeds the common mode voltage
limit of ±2V.
4. Floating Signal Source Measurements : A ?oating input is a signal
that, before it is applied to the DMS-40PC’s inputs, has no galvanic
DMS-40PC-1-GS
11
(+) IN HI
R1
1k
connection (direct current path) to the meter or the meter’s power
supply. The circuit shown in Figure 5 illustrates the necessary con-
DP1
12
(–) IN LO
R2
1k
nections for measuring ?oating inputs. The 1.5V battery represents a
true ?oating input signal since it initially has no connection whatso-
ever in common with the meter. Real-world ?oating inputs typically
120 VAC
1
+5V SUP
3
5V RET
R3
1k
originate from power supplies which are transformer isolated from
the DMS-40PC’s +5V supply.
The connection of pin 12 ((–) INPUT LO) to pin 10 (ANALOG COMMON)
is required in order to provide a bias return for the meter’s input
AC to DC Converter
Figure 3. Differential Input Con?guration
ampli?er.This is because neither pin 11 nor pin 12 are tied to any
reference voltage inside the DMS-40PC (see Figure 1). These connec-
tions are not made internally in order to give the meter the abil ity to
make differential measurements as described in a previous section.
3. Power Supply Monitoring : One of the most widely used digital panel
voltmeter applications is monitoring the output voltage of a system
power supply — often the same supply that also powers the meter.
11
(+) IN HI
DMS-40PC-1-GS
The low-power, red LED DMS-40PC-2-RL, with its excellent 0.001Vdc
resolution, can be con?gured to monitor power supplies with outputs
in the range of 4.5-18Vdc. The circuit in Figure 4 uses a low-drop-
1.5V
CELL
–
10
ANA COMM
12
(–) IN LO
out, three-terminal regulator (LM-2931T-5, in a T0-220 package,
available from National Semiconductor) to provide regulated 5V
1
+5V SUP
3
5V RET
6
DP1
power to the meter.
The LM-2931 was chosen because it has the following on-chip pro-
tection features: reverse polarity, short circuit and thermal runaway.
The DMS-40PC-3-RL can monitor voltages up to ±200Vdc, provided
a separate +5V power source is used since many three-terminal
regulators cannot operate with supply voltages greater than 24V. Red,
120 VAC
AC to DC Converter
Figure 5. Floating Input Measurements
low-power LED models, with their very low self-heating, are recom-
mended for applications in which low calibration drift is desirable.
www.murata-ps.com/support
09/27/11
MPM_DMS-40PC.C06 Page 4 of 6
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相关代理商/技术参数
DMS-40PC-1-RL-C
功能描述:数字面板表 4.5 Digit +-2V Input Low Power Red RoHS:否 制造商:Murata Power Solutions 设备类型:AC Voltmeters 显示器类型:LED, 3 Digit, Red 工作电源电压:85 VAC to 264 VAC 工作电源电流:50 mArms 输入电流:50 mA 输入频率: 输入电压:120 VAC 系列:DMS-20PC-1-LM
DMS-40PC-1-RS
功能描述:数字面板表 4.5 Digit +-2V Input Std Red RoHS:否 制造商:Murata Power Solutions 设备类型:AC Voltmeters 显示器类型:LED, 3 Digit, Red 工作电源电压:85 VAC to 264 VAC 工作电源电流:50 mArms 输入电流:50 mA 输入频率: 输入电压:120 VAC 系列:DMS-20PC-1-LM
DMS-40PC-1-RS-BCD
功能描述:数字面板表 4.5 Digit +-2V Input Std Red RoHS:否 制造商:Murata Power Solutions 设备类型:AC Voltmeters 显示器类型:LED, 3 Digit, Red 工作电源电压:85 VAC to 264 VAC 工作电源电流:50 mArms 输入电流:50 mA 输入频率: 输入电压:120 VAC 系列:DMS-20PC-1-LM
DMS-40PC-1-RS-BCD-C
功能描述:数字面板表 4.5 Digit +-2V Input Std Red RoHS:否 制造商:Murata Power Solutions 设备类型:AC Voltmeters 显示器类型:LED, 3 Digit, Red 工作电源电压:85 VAC to 264 VAC 工作电源电流:50 mArms 输入电流:50 mA 输入频率: 输入电压:120 VAC 系列:DMS-20PC-1-LM
DMS-40PC-1-RS-C
功能描述:数字面板表 4.5 Digit +-2V Input Std Red RoHS:否 制造商:Murata Power Solutions 设备类型:AC Voltmeters 显示器类型:LED, 3 Digit, Red 工作电源电压:85 VAC to 264 VAC 工作电源电流:50 mArms 输入电流:50 mA 输入频率: 输入电压:120 VAC 系列:DMS-20PC-1-LM
DMS-40PC-1-YS
功能描述:数字面板表 4.5 Digit +-2V Input Std Yellow RoHS:否 制造商:Murata Power Solutions 设备类型:AC Voltmeters 显示器类型:LED, 3 Digit, Red 工作电源电压:85 VAC to 264 VAC 工作电源电流:50 mArms 输入电流:50 mA 输入频率: 输入电压:120 VAC 系列:DMS-20PC-1-LM
DMS-40PC-1-YS-C
功能描述:数字面板表 4.5 Digit +-2V Input Std Yellow RoHS:否 制造商:Murata Power Solutions 设备类型:AC Voltmeters 显示器类型:LED, 3 Digit, Red 工作电源电压:85 VAC to 264 VAC 工作电源电流:50 mArms 输入电流:50 mA 输入频率: 输入电压:120 VAC 系列:DMS-20PC-1-LM
DMS-40PC-2
制造商:未知厂家 制造商全称:未知厂家 功能描述:4 1/2Digit, LED Display Precision, Miniature Digital Panel Voltmeters